QmlProfiler: show empty trace

In the case that the application did not generate any event
after running the profiler, still show an empty trace.
Otherwise the user will think that the profiler didn't work.

Change-Id: Idd15225270d55d834719f66387864433fcb9026d
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmlprofiler/qml/MainView.qml

@@ -176,6 +176,7 @@ Rectangle {
 
     function clearAll() {
         clearDisplay();
+        elapsedTime = 0;
     }
 
     function nextEvent() {

src/plugins/qmlprofiler/qml/StatusDisplay.qml

@@ -69,7 +69,7 @@ Item {
     states: [
         // no data available
         State {
-            when: (root.eventCount == 0) && !root.recordingEnabled
+            when: (root.eventCount == 0) && (elapsedTime > 0) && !root.recordingEnabled
             PropertyChanges {
                 target: statusDisplay
                 visible: true

src/plugins/qmlprofiler/qmlprofilerdatamodel.cpp

@@ -800,6 +800,8 @@ void QmlProfilerDataModel::complete()
         d->postProcess();
     } else
     if (currentState() == Empty) {
+        d->v8DataModel->collectV8Statistics();
+        compileStatistics(traceStartTime(), traceEndTime());
         setState(Done);
     } else {
         emit error("Unexpected complete signal in data model");
@@ -819,7 +821,6 @@ void QmlProfilerDataModel::QmlProfilerDataModelPrivate::postProcess()
         q->reloadDetails();
         prepareForDisplay();
         q->compileStatistics(q->traceStartTime(), q->traceEndTime());
-
     }
     q->setState(Done);
 }
@@ -1063,9 +1064,18 @@ void QmlProfilerDataModel::QmlProfilerDataModelPrivate::linkEndsToStarts()
 void QmlProfilerDataModel::compileStatistics(qint64 startTime, qint64 endTime)
 {
     d->clearStatistics();
+    if (traceDuration() > 0) {
+        if (count() > 0) {
             d->redoTree(startTime, endTime);
             d->computeMedianTime(startTime, endTime);
             d->findBindingLoops(startTime, endTime);
+        } else {
+            d->insertQmlRootEvent();
+            QmlRangeEventData *listedRootEvent = d->rangeEventDictionary.value(rootEventName());
+            listedRootEvent->calls = 1;
+            listedRootEvent->percentOfTime = 100;
+        }
+    }
 }
 
 void QmlProfilerDataModel::QmlProfilerDataModelPrivate::clearStatistics()
@@ -1074,7 +1084,7 @@ void QmlProfilerDataModel::QmlProfilerDataModelPrivate::clearStatistics()
     foreach (QmlRangeEventData *eventDescription, rangeEventDictionary.values()) {
         eventDescription->calls = 0;
         // maximum possible value
-        eventDescription->minTime = endInstanceList.last().endTime;
+        eventDescription->minTime = traceEndTime;
         eventDescription->maxTime = 0;
         eventDescription->medianTime = 0;
         eventDescription->duration = 0;
@@ -1661,10 +1671,6 @@ void QmlProfilerDataModel::setState(QmlProfilerDataModel::State state)
     d->listState = state;
     emit stateChanged();
 
-    // special: if we were done with an empty list, clean internal data and go back to empty
-    if (d->listState == Done && isEmpty()) {
-        clear();
-    }
     return;
 }
 

src/plugins/qmlprofiler/qv8profilerdatamodel.cpp

@@ -237,6 +237,15 @@ void QV8ProfilerDataModel::QV8ProfilerDataModelPrivate::collectV8Statistics()
             v8event->eventId = index++;
         }
         v8RootEvent.eventId = v8EventHash[rootEventHash]->eventId;
+    } else {
+        // On empty data, still add a fake root event
+        clearV8RootEvent();
+        v8RootEvent.totalPercent = 100;
+        QString rootEventHash = QmlProfilerDataModel::getHashStringForV8Event(
+                    QmlProfilerDataModel::rootEventName(),
+                    QmlProfilerDataModel::rootEventDescription());
+        v8EventHash[rootEventHash] = new QV8EventData;
+        *v8EventHash[rootEventHash] = v8RootEvent;
     }
 }
 

src/plugins/qmlprofiler/timelinerenderer.cpp

@@ -109,9 +109,11 @@ void TimelineRenderer::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWid
     int firstIndex = m_profilerDataModel->findFirstIndex(m_startTime);
     int lastIndex = m_profilerDataModel->findLastIndex(m_endTime);
 
+    if (lastIndex < m_profilerDataModel->count()) {
         drawItemsToPainter(p, firstIndex, lastIndex);
         drawSelectionBoxes(p, firstIndex, lastIndex);
         drawBindingLoopMarkers(p, firstIndex, lastIndex);
+    }
 
     m_lastStartTime = m_startTime;
     m_lastEndTime = m_endTime;
@@ -357,7 +359,7 @@ void TimelineRenderer::manageHovered(int x, int y)
     // find if there's items in the time range
     int eventFrom = m_profilerDataModel->findFirstIndex(time);
     int eventTo = m_profilerDataModel->findLastIndex(time);
-    if (eventTo < eventFrom) {
+    if (eventTo < eventFrom || eventTo >= m_profilerDataModel->count()) {
         m_currentSelection.eventIndex = -1;
         return;
     }